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He warns, however, the run-up to the election will be anything be easy.
Anything is possible," Obama said, of the potential for America to elect GOP nominee Trump, and Democrats shouldn't take anything for granted, he added during an interview with NBC's "Today Show."
"Anybody who goes into campaigns not running scared can end up losing."
The president, vice-president and two of the three survivors of the Mother Emanuel Church shooting in Charleston, SC. will be among those speaking Wednesday night at the convention.
Also on Wednesday night, Tim Kaine was nominated as Clinton's vice presidential running mate.
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